Internal grinding and honing machine



Mardi 24, 1942.4 las.A E. HANVsoN 2,277,589

INTERNAL GRINDING AND HoNING MAGNINE Filed Aug'. 219-l 1940 @for 6. Harmon Patented' Mar. 24, 1942 LUNl'r1=. D STATE INTERNAL Grrgnmc yAND HoNING CHINE K Bror E. Hanson, Worcester, Mass., assignor to The Heald Machine Company, Worcester, Mass., a corporation of Massachusetts 1940, serial No.'l 354,736

Application August 29 5 claims. The present invention relates to a machine surfaces /of hollow worlqpieces; the -invention resides in the provision of a simple and compact machine organization wherebyl with a "single chucking of the workpiece, the latters bore can be subjected, either successively or selectively, to a precision grinding operation and to a honing or lapping operation. In one of its aspects, the invention provides the honing apparatus in the form of an attachment readily applicable to a conventional type of internal grinding machine.

Other and further objects and advantages of the invention will more fully appear from the following detailed description thereof, taken in connection with the accompanying drawing in which Fig. 1 is a front elevational view of a machine embodying the invention.

Fig. 2 is a fragmentary larger scale plan view showing the positions of the associated grinding and honing devices, when theformer is in operative relation-to the workpiece bore.

- for grinding and honing the bores or interior of and by itself forms no part of the present Fig. 3 is a sectional view substantially on line 3-3 of Fig. 2, but showing the conditionswhich prevail when the honing device is operative on the workpiece bore.

j Like reference characters refer to like parts in the different gures.

Fig.- l shows a machine providing the essential elements of a conventional internal grinding machine, said' machine including a suitable base l which has longitudinal ways, not shown, for the back and forth reciprocations of a table 2. Such table movement serves` to obtain the longitudinal traverse of the workpiece bore by the grinding wheel; to this end the table may carry either the work or the wheel-with the other of said parts mounted on a stationary brldge-3 which spans the Ways, not shown, whereon the table slides. In the illustrated arrangement, the table 2 carries the grinding wheel 4, the latter being secured to a rotary spindle 5 which overhangs and is suitably journalled ina tool carrier 6 carried by a cross-slide 1 on the table 2. On its other end said spindle 5 carries a pulley 8 Whose driving belt, .not .lshown, produces the desired high speedsrotation of the grinding 'wheel for the grinding operation on the bore of each workpiece A. The .latter is received and held in a chuck or other suitable work-holdingdevice 9, whose hollow shaft I0 is rotatively mounted in a workhead II on the bridge 3; the chuck shaft has a pulley I2 whose belt, not shown, imparts rotationl to the workpiece A durl bore, and to provide for a wheel, during the grinding operation, into said' surface until the vdesired size of boreV is obtained, the cross slide 1 carrying the wheelhead is sub-` invention" and `need not be described in detail; it is sufficient to point out that the grinding reciprocations of the table 2 are controlled by apair of spaced adjustable dogs I3 and I4 thereon, arranged to engage alternately with a member I5 whose movements are transmitted` to a reversing valve, not shown, in the uid pressure system, said valve causing the fluid` under pressure to be admitted first to one side and then to the other side of a cylinder and piston unit, not shown, having an actuating connection 2 with the table 2. In order to shift the grinding wheel transversely into and out of cutting relationito the surface of the workpiece gradual feed of said ject to movement, either manually,- or automatically in any. rwell Iknown manner, by the usual feed screw .'I, which carries a handwheel "nlV According to my invention thetool carrier 6, in order to provide support for the honing or lapping devices hereinafter described, may havean extension or quill 6 surrounding the overhanging portion of wheel spindle 5. Said member 6' on its outer upper surface and on its outer lower surface provides the pairs of lugs I6, I6 and I1, I1; attached 'to these lugs in any suitable manner are/the two pairs of flat leaf spring members I8, vI8 and I9, I9 all projecting laterallyA from the quill 6 in the same direction, i. e.-

away from that side of the grinding wheel 4A which makes contact with the workpiece bore. To the outerv ends of all four of'said leaf springs |8, I8, I9, I9 is attached, in any suitable manner a plate 20, the latter as shown in Fig. 2 being thus disposed and held in a vertical plane which is substantially offset, laterally, from that side Iof grindingl wheel 4 which is opposite said wheels line of contact with the workpiece' bore-this arangement and spacing thus permitting said I5 plate' 20 to extend well beyond the quill 6" and and honing operations on the bore is enlarged to the desired size.

.turning the screw l Oppositely,

to occupy at its outer or free end the same transverse zone as that occupied by the grinding wheel.

On the spindle 5 of the-grinding wheel beyond formed a cam 2| pro-Q the quill 6' is secured or viding a'n encircling helical track or groove 22. The plate on its inner surface, substantially in the transversezone occupied .by said cam, provides a hollow boss.23 whose bore, substantially at right angles to the grinding "wheel spindle axis and extended through the plate 20, receives slidably a pin 24 whose outer end beyond plate 2li` carries an enlargement or knob. pin either inwardly,V

by which to move said to operatively engage its inner end with groove 22, or outwardly, to dispose said pin in its inoplerative position. Spaced grooves 26 and 2l on against a yieldable member or spring 3l, andA the bore from en d to end, since the reciprocations of the table 2-carry thevibrating hone, the same as they do'the rotating grinding wheel, back and forth` over the entire length of the bore, with 1 the work-piece rotation at the same time sub- 'jecting all portionsrof i the action of said stone.

I claim: 1. In` a machiney of .the class described, a rotary workholden' a rotary grinding wheelv for bores surface to the operation on the bore of a workpiece in said workholder, -means for imparting a relative axial reciprocation to saidparts to traverse said wheel from oneend to the other of said bore, a honing member fiexibly connected to the support of said wheel and adapted by` said reciprocation to make an end-to-end traverse of said bore, crossfeed means operable in one direction to engage said wheel with said bores surface and to space said honing member therefrom, and operable in the other direction to engage said honing membei` with said bores surface and to space said grinding wheel therefrom, a cam rotating with said grinding wheel and means for detachably engaging said 4cam with saidV honing member to vibrate the latter by flexure of its connection during its operation on said bore.

has'a certain limited freedom of movement within the holder 29,` to permit ity to adjust-'its position in accordance with its outer-surfaces engage'- ment with the work. Such engagement as shown in Fig. 3 is made with that portion or'side of the workpiece bore which is diametrically opposite-to the side or portion engaged by the grinding Wheel 4 (Fig. 2).

In the operation of the machine, the grinding of the'workpiece bore to the desired sizeby the Wheel 4 takes place in the usual manner,` preferably with the pin 24 in its inoperative position (Fig. 2) that is to say, the operator by manipulation of the. table control lever 32, Fig. 1, vcauses the table 2, in the manner set forth in the aforesaid `Heald and Guild Patent 1,582,468, to move leftwards from the rest position shown in Fig. 1, to carry the grinding wheel into the workpiece bore, this movement positioning the dogs f3 and i I4 on opposite sides of the member l5, so that the table thereafter reciprocates in a grinding range, moving the wheel 4 back and forth from one end to the other of said bore. The hand wheel 1 may be employed to cross-feed the wheel quickly into contact with the workpiece bore (Fig. 2) andthe grinding then proceeds with progressive cross' feeding of the wheel (either manual or automatic) by the screw 1 u'ntil the `Then, by the wheel is backed off from the ground surface, such movement causing the stone vil) to approach correspondingly a diametrically-opposite portion of Y said surface.

With the pin 24- now pushed inwardly to engage the cam groove 22, a very short and rapid reciprocation, of the order of` a vibrathe rotation of spindle 'l5- the spring supports this purpose.

` I8 and I8 for said structure exingfreadilyjor Thus the vibrating stone Sfbrought into contact withthe'bore ofthe rotating workpiece by f tion, is set up in the stone-carrying structure by said bore.

2. In a; machine of the class described, a rotary workholder, a rotary grinding wheel for operation on the bore of a workpiecev in saidl .work holder and said head or`sup`port, whereby the tool selectively made operative by said crossfeed means effects an abrasive traverse of said bore from end to end, a-cam onY saidspindle, and meansY for detachably engagingsaid cam with saidhoning memberto'vibrate the latter by iiexureof its connection during its abrasive traverse of said bore.

3. In a machine of the class described, abase. a table reciprocatable on said base, a rotary workholder arranged on one of said parts and a tool carrier arranged on the jother of said parts, a rotary grinding wheel projecting from said tool carrier for operation on the bore of a workpiece in said workholder, a honing member flexibly connected to said toolcarrier and occupying substantialiy the same zone, transversely of said machine. as said grinding wheel,.means for crossfeeding said tool carrier in one direction to operatively engage said grinding wheel with the workpiece bore, .means for cross-feeding said tool carrier in the opposite directionto operatively engage said honing member with the workpiece bore, means for reciprocating` said table whereby lthe toolselectively made operative by said crossfeed means ,effects an abrasive traverse of said bore from` end to end, a cam rotating with said grinding wheel, and means for dtachably engaging said camliwith said honing member to vibrate the` latter by flexure of its said connection to s aid carrier, during its abrasive traverse of 4. In a machine of the class described, a rotary workholder, a tool carrier, a rotary spindle journalled in said carrier, a grindng wheel on and means fordetachably engaging said cam relatively reciprocating said work.

with said honing member to vibrate the latter by exure of its supporting member, during its `abrasive traverse of said bore.

5. A honing attachment applicable to' the Wheeihead of an internal grinding machine, comprising a honing member, a fiexible connection supporting said honing member in diametrically opposed relation to the grinding wheel of said machine, a cam rotating with said wheel, and means for detachabiy engaging said cam with said honing member to procure the latter's vibration by fiexure of said connection.

BROR E. HANSON. 

